fix warnings

Fix a couple warnings so we can use meson warning level 3.  Instances of
the following warnings are found and resolved:

  Wreorder
  Wsign-compare

Change-Id: Ia223b42aa6bf743cfa0e7042cc3d5a18977459be
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/include/CPUSensor.hpp b/include/CPUSensor.hpp
index 589b1f6..8f9cb6e 100644
--- a/include/CPUSensor.hpp
+++ b/include/CPUSensor.hpp
@@ -43,7 +43,7 @@
     double privTcontrol;
     double dtsOffset;
     bool show;
-    int errCount;
+    size_t errCount;
     void setupRead(void);
     void handleResponse(const boost::system::error_code& err);
     void checkThresholds(void) override;